A new algorithm to correct fish-eye- and strong wide-angle-lens-distortion from single images.pdf

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1、ANEWALGORITHMTOCORRECTFISH-EYE-ANDSTRONGWIDE-ANGLE-LENS-DISTORTIONFROMSINGLEIMAGESChristianBrauer-BurchardtandKlausVossFriedrichSchillerUniversityJena,DepartmentofComputerScience,DigitalImageProcessingGroupD-07740Jena,Germanyemail:cbb0pandora.inf.uni-jena

2、.deABSTRACTrequiresubstantialeffortasmuchascameracalibration.However,inmostcases,theprocessofcameracalibrationTheuseofsuper-wideangleandfish-eyelensescausesprovestobetoocostlyorimpossibletoexecute.Analter-strongdistortionsintheresultingimages.Amethodology

3、nativesimplermethodologyisrequiredinsuchsituations.forthecorrectionofdistortionsinthesecasesusingonlyAmethodusingjusttheassumptionofthelinearityofsingleimagesandlinearityofimagedobjectsispresentedlinesandtheinformationavailablefromonesingleimageinthiswork

4、.Contrarytomostformeralgorithms,thealgo-waspresentedbyPrescottandMcLean[6].However,therithmdiscussedheredoesnotdependoninformationaboutproposedestimationofstraightlineparametersbyleasttherealworldco-ordinatesofmatchingpoints.Moreoversquareslinearregressio

5、nisnotrobustenoughincasesofreferencepointsdeterminationandcameracalibrationisverystrongdistortionsresultingfromfish-eyelenses.notrequiredinthiscase.Thenecessaryassumptionaboutlinearitycangener-Thealgorithmisbasedoncirclefitting.Itrequiresallybemadeusingim

6、agesofarchitecturalobjects.Intheonlythepossibilityoftheextractionofdistortedimagefieldofbuildingreconstructionandarchitecturalmodelingpointsfromstraightlinesinthe3Dscene.Further,thethereliesthenecessityforthesolvingofreconstructionactualdistortionmustappr

7、oximatelyfitthechosendistor-taskswithinputimageswhichisalwaysobtainedwithtionmodel.Formostfish-eyelensesappropriatedistortionexpensivedistortionfreecamerasystems.Soimagedis-correctionresultscanbeobtained.tortionscausedbytheeffectsofradiallensdistortionofw

8、ideangle-lensesareunavoidable.Givenanimagewithstrongradialdistortion(see1.INTRODUCTIONFig.la)thefirstgoalistodeterminetheparametersoftheradiallensdistortion,i.e.thedistortionfunctionandtheItisnotalwayspossibletohave